Design and Implementation of Torque Control and Estimation for an Electric Hand-Tool

  • Tian-Hua Liu National Taiwan University of Science and Technology
  • Cheng-Wei Peng National Taiwan University of Science and Technology
DOI: https://doi.org/10.18282/fme.v2i2.801
Keywords: Brushless DC Motor, Electric Hand-Tool, Torque Estimation, Digital Signal Processor

Abstract

This paper proposes the design and implementation of torque control and torque estimation for an electric hand-tool. This hand-tool does not require any torque transducer or any Hall-effect sensor. Only some low-cost resistances are used to measure the stator currents of a brushless DC motor, which is used to drive the hand-tool. Novel 3-phase current commands are proposed here to obtain greater torque than traditional 3-phase, square-wave current commands. The output torque of the hand-tool can be estimated and displayed by an LED display. A PI controller is used to achieve the current-loop control. A digital signal processor, TMS-320-F2808 that was manufactured by Texas Instruments, is used to execute the control and estimation algorithms. Experimental results show the correctness and feasibility of the proposed methods.

Author Biography

Tian-Hua Liu, National Taiwan University of Science and Technology

Tian-Hua Liu was born in Taoyuan, Taiwan. He received the B.S., M.S., and Ph.D. degrees from National Taiwan University of Science and Technology (Taiwan Tech), Taipei, Taiwan, in 1980, 1982, and 1989, respectively, all in electrical engineering.

He was a Visiting Scholar at the Wisconsin Electric Machines and Power Electronics Consortium (WEMPEC), the University of Wisconsin-Madison, WI, USA, from 1990 to 1991, at the Center of Power Electronics Systems, Virginia Polytechnic Institute and State University, Blacksburg, USA, from 1999 to 2000, and at the Department of Electrical and Computer Engineering, Auckland University, New Zealand, from July 2015 to Nov. 2015.

He served as a Chair of Electrical Engineering Department and then a Dean of Electrical Engineering and Computer Science College at National Taiwan University of Science and Technology. Currently, he is a distinguished Professor and serves as the Provost of National Taiwan University of Science and Technology. 

His research interests include motor controls, power electronics, and DSP-based control systems. He is currently an Associate Editor of IEEE Transactions on Industrial Electronics and an Associate Editor of IET Electric Power Applications.

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Published
2020-06-09
Issue
Vol 2, No 2: (Published)
Section
Original Research Articles

Copyright (c) 2020 Frontiers of Mechatronical Engineering

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